This presentation folio is made from acid-free grey card and includes black ribbon ties for easy fastening. It is suitable for carrying works on paper of up to A3 size. The design is such that you can easily customise it to your own liking. An economical solution that's great for students.
I love these. I run a small architecture practice and have switched to using these rather than the plastic equivalent. Surprisingly the only one on the market I could find which is of a presentable standard.